No problem, we've got 90448887 and 72081945 to multiply
90448887 × 72081945 = 72081945 × (90448887)
+ 72081945 × 7 what gives us 504573615
+ 72081945 × 80 giving us 5766555600
+ 72081945 × 800 producing 57665556000
+ 72081945 × 8000 that equals 576655560000
+ 72081945 × 40000 yielding 2883277800000
+ 72081945 × 400000 that equals 28832778000000
+ 72081945 × 0000000 producing 0
+ 72081945 × 90000000 producing 6487375050000000

= 6519731698045215
